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ssh: Support BDRV_REQ_ZERO_WRITE for truncate 

Our .bdrv_has_zero_init_truncate can detect when the remote side
always zero fills; we can reuse that same knowledge to implement
BDRV_REQ_ZERO_WRITE by ignoring it when the server gives it to us for
free.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200428202905.770727-7-eblake@redhat.com>
Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2020-04-28 15:29:02 -05:00 committed by Kevin Wolf
parent fec00559e7
commit be9c9404db
1 changed files with 4 additions and 0 deletions
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4
block/ssh.c
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@ -883,6 +883,10 @@ static int ssh_file_open(BlockDriverState *bs, QDict *options, int bdrv_flags,
/* Go non-blocking. */
ssh_set_blocking(s->session, 0);
if (s->attrs->type == SSH_FILEXFER_TYPE_REGULAR) {
bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
}
qapi_free_BlockdevOptionsSsh(opts);
return 0;